Try Windows Server 2012 R2 on Microsoft Evaluation Center
https://www.microsoft.com/en-us/evalcenter/evaluate-windows-server-2012-r2
Windows Server 2012 R2 helps you build, deploy and scale applications and web sites quickly, and gives you the flexibility to move workloads between on-premises environments and the cloud.
Windows Server 2012 - Wikipedia
https://en.wikipedia.org/wiki/Windows_Server_2012
Windows Server 2012 is the fifth version of the Windows Server operating system by Microsoft, as part of the Windows NT family of operating systems.